My demo Chazz Headphone Amp is up for sale. Very low hours. VA 274B rectifier, NOS Sylvania 6SL7 driver with a pair of VA EL-34 output tubes. Pair of RCA input jacks with both a balanced and 1/4 output jack for the headphones. There is also a switch for Ultralinear and Triode modes of operation. Silver volume Knob matches the On/OFF knob. 9/10 condition, with the original shipping box. $500